Curve-fitting is an art, and a whole article could easily be devoted to it, but look up help fit and the beginners_guide and tips sub-topics to getastart.
曲线拟合是一门艺术，需要用一整篇文章来讲述，但是请参阅 help fit 和 beginners_guide and tips 来对它获得初步了解。
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The NSG was set up precisely to stop countries doing what India did to getastart in the bomb business: abusing technology and skills provided for civilian purposes.
To get the actual data bytes per second, you would have to take two samples (to getastart value and an end value), and divide the difference by the duration between the samples.